fix: freedraw slow movement jittery lines (excalidraw#4726)

Co-authored-by: David Luzar <[email protected]>
genieba · Feb 6, 2022 · 96de887 · 96de887
1 parent 98ea466
commit 96de887
Showing 1 changed file with 13 additions and 7 deletions.
diff --git a/src/components/App.tsx b/src/components/App.tsx
@@ -3852,14 +3852,20 @@ class App extends React.Component<AppProps, AppState> {
         const dx = pointerCoords.x - draggingElement.x;
         const dy = pointerCoords.y - draggingElement.y;
 
-        const pressures = draggingElement.simulatePressure
-          ? draggingElement.pressures
-          : [...draggingElement.pressures, event.pressure];
+        const lastPoint = points.length > 0 && points[points.length - 1];
+        const discardPoint =
+          lastPoint && lastPoint[0] === dx && lastPoint[1] === dy;
 
-        mutateElement(draggingElement, {
-          points: [...points, [dx, dy]],
-          pressures,
-        });
+        if (!discardPoint) {
+          const pressures = draggingElement.simulatePressure
+            ? draggingElement.pressures
+            : [...draggingElement.pressures, event.pressure];
+
+          mutateElement(draggingElement, {
+            points: [...points, [dx, dy]],
+            pressures,
+          });
+        }
       } else if (isLinearElement(draggingElement)) {
         pointerDownState.drag.hasOccurred = true;
         const points = draggingElement.points;